Did you read where some guy tested them with a captive western diamondback?.....I can think of better ways to test something rather than letting a snake bite me while wearing them.
A friend of mine was bitten by a large cottonmouth in Miss. some years ago while wearing hightop leather boots that had an inside liner,the fangs went through the outside of the boot and got caught between the layers.
After wetting his pants,literally,and killing the snake,he said it felt like someone hit him with a ball bat,leaving a softball sized bruise on his calf.